What is the charasteristic of tapetum ?

(1) It does not store food.

(2) It is multi-nucleated.

(3) It is multi-layered structure.

(4) It nourishes the megaspore.

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Cleistogamy is leadingover anthesis because

(1) pollination agent is not required

(2) it assures heterozygosity

(3) it favours insect pollination

(4) it allows xenogamy

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Sporopollenin is a constituent of pollen exine.

It can be degraded by the action of 

(1) enzymes

(2) high temperature

(3) strong acids

(4) cannot be degraded

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The pollen grains of rice and wheat lose their viability in ___ minutes of their release.

(1) 30

(2) 10

(3) 60

(4) 90

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After double fertilizaton, a mature ovule has

(1) 1 diploid and 1 haploid cell

(2) 1 diploid and 1 triploid cell

(3) 2 haploid and 1 triploid cell

(4) 1 haploid and 1 triploid cell

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How many haploid nuclei are present in a mature pollen grain?

(1) One

(2) Two

(3) Three

(4) Four

Concept Questions :-

Double Fertilization
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What is the correct sequence of the formation of female gametophyte in angiosperms?

(1) Nucellus, megapore tetrad, megaspore mother cell, megaspore, female gametophyte

(2) Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte

(3) Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte

(4) Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte

Concept Questions :-

Pistil: Female Gametophyte
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Primary endosperm nucleus (PEN) is formed by the fusion of

(1) 2 polar nuclei + 1 synergid cell nucleus

(2) 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleuus

(3) 2 polar nuclei + 1 male gamete nucleus

(4) 2 antipodal cell nuclei + 1 male gamete nucleus

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Identify the parts labelled A, B, C and D in the given figure and select the correct option.

 

        A

        B

        C

        D

(1)

Scutellum  

Epiblast

Coleoptile

Coleorhiza       

(2)

Scutellum

Coleorhiza   

Coleoptile

Epiblast

(3)

Scutellum

Coleoptile

Coleorhiza   

Epiblast

(4)  

Epiblast

Coleoptile

Coleorhiza

Scutellum

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Match column I with column II and select the correct option from the given codes.

 

      Column - I

 

              Column - II

A.

Parthenocarpy

(i)

Seed formation without fertilization

B.

Polyembryony

(ii)

More than one embryo in same seed

C. 

Apomixis

(iii) 

Seedless fruits without fertilization

D.

Somatic embryogenesis   

(iv)  

Embryo develops from a somatic cell

(1) A - (iv), B - (ii), C - (iii), D - (i)

(2) A - (iii), B - (ii), C - (i), D - (iv)

(3) A - (i), B - (iv), C - (iii), D - (ii)

(4) A - (ii), B - (iii), C - (i), D - (iv)

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